Grabovac, Igor
Brath, Helmut
Schalk, Horst
Degen, Olaf
Dorner, Thomas E.
Article History
Accepted: 13 April 2017
First Online: 20 April 2017
Compliance with ethical standards
:
: The authors report no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. Study protocol was reviewed and deemed ethically appropriate by the Ethical Committee of the City of Vienna for the Austrian centre and by the Ethical Committee of the Chamber of Medical Doctors in Hamburg for the German centres.